From their FAQ ( http://oxygenaccelerator.com/accelerator/faqs/ ): When do I have to pay the pre-seed funding back? Don’t worry, we really don’t want you to hand over the keys to your house or car – this is a soft loan. Our interest is in your success and therefore will only look for the loan to be repaid when it makes sense for your business. This will be done on a case-by-case basis.
Anyone who's lost money in their startup investment knows what I'm talking about. ("Oh yeah, I know it's risky, don't worry" ... "Wait, did you try hard enough? What are going to do, jump ship NOW??")
Their idea of an "evergreen" fund is cute, but it's ultimately flawed. Most startups fail.